Mark CMG said:
This pertains to the d20 STL not the OGL, except in that the d20 STL requires, first, that you are working under the OGL (in this case, though it is possible to have a separate arrangement that allows you to use the d20 logo without the OGL or d20 STL). You are mistaken to believe that you cannot give up rights by contract to gain other rights.
(If you're not familiar with the OGL and d20 STL, please refrain from stepping in.)
Tell you what, anyone who wishes to comment further and be taken seriously, please go first to the legal page on that website and tell me what is the first huge legal red flag that you see. Then we'll discuss this further . . .
At it pertains an experience point level calculator, I think you're wrong, though it would likely be an interesting teaching case in Federal court if it ever came to that to give instruction just on what the limits of copyright are, especially when there is an open license involved.
However, if the owner of that web page wants to be clever, he can just make the experience point calculator operate on 'units' instead of 'experience points' and instead of doing 1000 per level, do one per level, such that second level is at '1' unit, third level is at '3' units, and so on, and he'd get exactly the same thing functionally for anyone who uses it, and there'd be absolutely nothing wizards could do about it, because then for them to even file a claim would almost be frivolous, perhaps even a rule 11 violation resulting in sanctions against Wizards. Perhaps that would be an instructive case to watch as well.
Another option would be to make it open ended, with the user of the web page entering the 'units' and then the web page calculating using only the formula, so you plug in 'level 3' and '1000' and it spits out '3000' as the answer. (As opposed to plugging in 'level 3' and '100' where you'd get '300' as the answer, etc.)
In either of those cases, you would not be using anything of wizards on the web page but half of the underlying mathematical formula, and guess what? There's no way you can stretch copyright or contract law to prevent someone from using half of a trivial mathematical formula.